ZINNER GMBH PRÄZISIONSWERKZEUGE

Thread turning is a special turning process.In thread turning a distinction is made between three different forms of presentation; the use of these depends on the thread pitch, the machine tool, the work-piece material and the cutting edge geometry. In the case of large threads, the tool must traverse the same track several times, penetrating deeper each time. The full depth of cut is therefore divided into several smaller cuts, thus preventing an overload on the sensitive tip of the thread profile of the cutting edge. In order to ensure profile accuracy, the helix angle of the thread must coincide as far as possible with the angle of inclination of the threaded plate. Thread turning method

CBN (cubic boron nitride) is the next hardest material after diamonds. When properly used, tools made from CBN exhibit considerably less wear than other materials. Cutting inserts or even VHM tools can be equipped with CBN. Technical application: Hardened tool steels with hardnesses greater than 55 HRC or high speed steels (HSS) can be machined without problems using CBN. Case hardened steels and chilled cast iron can also be machined with CBN. Non-ferrous metals are totally unsuitable for CBN; diamond tools are needed for these.

ZINNER PKD or highly positively polished cutting inserts are used for machining aluminium and copper. Glass-fibre reinforced materials are machined with PKD or coated PKD tools. Diamond tools are ideally suited for the high gloss turning of non-ferrous metals.

The most common form of milling is face milling; an extremely wide range of tools can be used for this process, ranging from a HSS milling cutter through to high speed milling cutters with cutting inserts in many different shapes and geometries. Several points must be watched in high speed milling and therefore a progressive cut should be preferred. The entry radius is crucial and this should therefore be programmed on entry and exit. It is particularly important that the feed rate should also be reduced when entering the work-piece until the milling cutter is fully engaged. Tool selection FMA 01: a soft cutting milling tool with a large positive cutting geometry in the 50- 315 mm diameter range. Wiper inserts also provide the best surface quality. FMA 07: a new, highly economical milling cutter with 16 cutting edges for machining steel and grey cast iron. FMD 02: a top clamping system for changing inserts quickly and easily; it is also very economical thanks to its 12 cutting edges arranged on two sides. FMD 03: These milling cutters form part of our range for use in heavy roughing, deep cutting depths up to 17 mm and diameters from 125 - 400 mm.

Technical information: In step milling, two faces are machined at the same time to create a 90° shoulder. There is a wide range of tools available for step milling and the user should select his tool so that it is ideally suited to the work-piece.

Technical information: Disc milling cutters are ideally suited for machining long, deep grooves quickly and cost-effectively. It is also possible to incorporate disc milling cutters into a set and cut several grooves at the same time. Tool systems: The Zinner RC disc milling cutter can efficiently machine deep grooves with depths from 1.6 mm to 8.0 mm. If necessary, they can also be used for parting. The cutting tips of the RC disc milling cutter and be customised to meet almost every customer requirement. The SPM 03 disc milling cutter can cover a range of cutting widths from 8.0 -20 mm; this variant is equipped with left and right cutting inserts.

Technical information: In profile milling the contour of the milling cutter is transferred directly onto the work-piece. However, many contours are now incorporated into standard milling cutters and therefore special milling cutters are not needed.

Technical information: PCD, CBN and diamond coated milling cutters are best used for the machining of non-ferrous metals, cast materials and special materials. Polycrystalline diamond (PCB) is a synthetic, extremely hard composite mass of diamond particles randomly oriented in a metal matrix. It is manufactured under high pressure and temperatures from selected diamond particles. Because of its fundamental hardness, CBN makes it possible to machine steels with hardnesses up to 70 HRC. The ability of CBN to withstand high speeds and feed rates, along with its good tool life, stable inserts and a precision milling machine guarantee unequalled process reliability, performance and cost effectiveness.

Zinner has a comprehensive range of HSS and carbide boring tools. The extensive spectrum of tools in the Zinner boring system enables you to find the right boring tool for your special job. Features of the modular drill The positioning of the inserts is optimised for a balanced distribution of cutting forces. The generous chip space ensures efficient chip removal. The diameter range is from 16 mm - 58 mm. Reamers are designed to optimise work processes – boring and reaming in one process. Tool systems Twist drills in solid carbide and HSS for mild and stainless steels. Deep hole drills up to 30 x D in solid carbide. 3-lipped drills for grey cast iron and aluminium alloys. Modular drills for various coatings for particular machining situations. Solid carbide drills High speed steel drills (HSS) Exchangeable tip drills Solid carbide end mills Polycrystalline diamond drills (PCD drills) Modular drills Deep hole drills

When drilling, it is vital to ensure than concentricity is < 0.02 mm. The fundamental problem when drilling: if the cutting forces are high, the feed rate must be reduced. The same factors apply when step-drilling.